Budget Mural Paint Volume Before Buying Tins — Free
Paint estimates fail on coats and coverage, not on wall size. Multiply area by coats, divide by the coverage printed on the tin you are using, and buy for the job rather than for the wall.
The proof surface
Paint mix ratio tools split a batch into colour and medium by parts. This converts wall areas and coat counts into litres so the tins on the trolley match the job.
Why the flat version breaks
Multiplying wall area by coats after dividing by coverage
Order of operations changes the answer: coats multiply the area before coverage divides it.
Forgetting the second coat on patched areas
Fresh filler absorbs far more paint than the surrounding wall.
Assuming leftover paint keeps forever
Part-used tins skin over and water-based paint splits in frost, so buy for the job.
How to work the paint coverage strip
Enter every section with its own area in square metres so a rough render panel and a sealed plaster wall are not averaged together.
Deep colour changes, patched plaster and porous render often take three coats. Eighteen square metres at two coats is 36 square metres of painted area.
Coverage printed on the tin usually assumes a sealed, even surface; take the conservative figure and subtract nothing for optimism. At 8 square metres per litre, 36 square metres needs four and a half litres.
The strip totals litres and flags any single section needing more than a five-litre tin. A stairwell section at seven and a half litres means either a larger tin or a brush-and-roller refresh mid-job.
What the paint coverage strip replaces
| Question | Before | Visible working |
|---|---|---|
| Multiplying wall area by coats after dividing by coverage | Order of operations changes the answer: coats multiply the area before coverage divides it. | Count the coats you will really need |
| Forgetting the second coat on patched areas | Fresh filler absorbs far more paint than the surrounding wall. | Use coverage from the product you bought |
| Assuming leftover paint keeps forever | Part-used tins skin over and water-based paint splits in frost, so buy for the job. | Buy tins against the flagged sections |
A local arithmetic aid replaces hand calculation, not expert review. No paid AI service is needed.
Run it on the samples, right here
FIRST-LOAD
Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Volume arithmetic on areas, coats and product coverage you supply. Not decorating, chemical-safety or structural advice; check the manufacturer’s coverage, drying and ventilation requirements, and get a specialist opinion on unstable or damp walls.
Data note: Everything runs in this browser tab on the paint coverage strip: your wall section | area square metres | coats stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Go deeper: the companion app files the same reading as a paper ticker strip
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the paint coverage strip reading, and holds your drafts on this device — one free run, then $ 4 one-time for the layer that keeps filing.
The paint coverage strip reading is complete for free. The optional $4 layer adds print, row CSV and the last five local reading summaries; it does not add hidden answers. Checkout is not configured yet; the article demo remains unlimited.
Open the budget mural paint volume before buying tins companionBoundary
Volume arithmetic on areas, coats and product coverage you supply. Not decorating, chemical-safety or structural advice; check the manufacturer’s coverage, drying and ventilation requirements, and get a specialist opinion on unstable or damp walls.
What this is built on
- Method: Coverage printed on the tin usually assumes a sealed, even surface; take the conservative figure and subtract nothing for optimism. At 8 square metres per litre, 36 square metres needs four and a half litres.
- All sample records are invented examples. The app does not fetch measurements, policies, files or personal records.
- Google’s official pricing page, fetched 2026-09-29, lists free-tier access including AI Studio. Optional formatting only; limits and availability can change. Free-tier content may be used to improve products. Never paste private records there.
Before: Order of operations changes the answer: coats multiply the area before coverage divides it. After: the paint coverage strip shows the working beside each named row so the reader can change the assumption and inspect the consequence.
Optional AI formatting, not calculation
For this paint coverage strip, use the free AI Studio interface only if available to you, with no paid API key. Manual entry completes the same workflow for free. Supply only fictional or non-sensitive notes. Review its output against the source; never paste unresolved questions into the numeric rows.
Format my non-sensitive notes for a paint coverage strip. Return plain rows only: wall section | area square metres | coats. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: wall section | area square metres | coats. No AI response is executed as code.